Walls more attractive than others!

So you have a base and you use funnelling to direct say giants to a mortar in order to make them walk over spring traps.However one commen problem is that they survive the spring trap and then have nothing stoping them from attacking the mortar,and if you had a wall surrounding it then the giants wouldn't go there in the first place because its to hard for them and the spring trap wouldnt work.so you could have the option to turn say 5 of your walls into 'trick walls!' they would look the same and have the same hit point but attacking giants think they are easier target when they are not,so you can channel giants and have a wall i front of a defence ... If that makes sence

PLEASE HELP PROMOTE THE FANTASTIC IDEA!

Then either everyone would have all their walls set to the lowest possible look, which would make it ♥♥♥♥♥♥ed.

Or you'd see 3 walls that look completely different from the rest and immediately know it was a trick wall.

I don't see the point.